Upgrade to Rails 6

[harsh183]

https://www.toptal.com/ruby-on-rails/rails-6-features

It's been out for a bit and has quite a few features that might be useful as well as many security patches. Rails5 to Rails6 won't be drastic with many guides around.

That said, I suggest having a good test coverage in place first, so this way you can make changes with gems and features with a lot more confidence.